Author: ["Jeffrey D. Rinehart","Ming Fang","William J. Evans","Jeffrey R. Long"]
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Abstract
Single-molecule magnets approach the ultimate size limit for spin-based devices. These complexes can retain spin information over long periods of time at low temperature, suggesting possible applications in high-density information storage, quantum computing and spintronics. Notably, the success of most such applications hinges upon raising the inherent molecular spin-inversion barrier. Although recent advances have shown the viability of lanthanide-containing complexes in generating large barriers, weak or non-existent magnetic exchange coupling allows fast relaxation pathways that mitigate the full potential of these species. Here, we show that the diffuse spin of an N23− radical bridge can lead to exceptionally strong magnetic exchange in dinuclear Ln(III) (Ln = Gd, Dy) complexes. The Gd(III) congener exhibits the strongest magnetic coupling yet observed for that ion, while incorporation of the high-anisotropy Dy(III) ion gives rise to a molecule with a record magnetic blocking temperature of 8.3 K at a sweep rate of 0.08 T s−1. Single-molecule magnets hold great promise for device miniaturization but the blocking temperatures at which they perform must first reach practical values. Now, the electronically diffuse N23− radical bridge has been shown to endow two di-lanthanide complexes with good magnetic properties — a di-gadolinium complex displays a strong magnetic coupling and its di-dysprosium analogue a high blocking temperature.Cite this article
Rinehart, J., Fang, M., Evans, W. et al. Strong exchange and magnetic blocking in N23−-radical-bridged lanthanide complexes. Nature Chem 3, 538–542 (2011). https://doi.org/10.1038/nchem.1063 